was flight 370 and the 239 passengers and crew members onlored disappeared without a trace in the biggest aviation mystery in the world. now the international air transport association is trying to make sure that never happens again, releasing its safety proposal for airline carriers including four-dimensional tracking which locates the airplane tracking and is accurate to withone nautical mile and the group suggests updating xhieshcation protocols and equipment and some airlines are pushing back on the proposal especially the 12-month timeline. joining me from new york, cnn aviation airlines analyst miles o'brien. >> you have to remember one thing, the devices in this case, the transponder and the satellite link in malaysian airlines 370 were evidently turned off and so no matter what you do, if someone onboard decides to turn all those devices off, we're right where